It's sad that less people we're inspired to donate earlier, but IMO the whole "you're just realizing this now?" thing is unproductive.

Every person has a moment when they wake up and decided to step up, usually several. Litigating their decision process after he fact does nothing to help. Just say "thanks and welcome, now let's go wake up some others."

Momentum is important and true or not this kind of stuff serves only as a speedbump.